JPS6051656B2 - Control device for dynamometer system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a dynamometer system that measures the performance of, for example, an automobile.

Conventionally, there has been a control device of this type as shown in FIG.

In the figure, reference numeral 1 denotes a test object typified by an engine of a front wheel drive automobile, and a pair of output shafts 2a, which are connected to each other via a differential device of this engine.
Dynamometers 3a and 3b are connected to dynamometers 2b, respectively.
4a and 4b are torque detectors provided in the dynamometers 3a and 3b, respectively, and detection signals of torque values detected by these torque detectors are input to torque control circuits 5a and 5b, respectively.

On the other hand, the torque control circuits 5a and 5b each receive a torque signal 6 given from the outside, and control each control power source 7a and 7b based on this torque signal 6 and the detection signal of the torque detectors 4a and 4b, thereby controlling each power source. A total of 3a and 3b are controlled so that a desired torque value according to the torque signal 6 can be obtained. Therefore, each output shaft 2a, 2
b is torque controlled. However, since the control device of the conventional dynamometer system is configured as described above, the speeds of the dynamometers 3a and 3b are connected to each other via differential gears, so there is nothing other than their total speed. It is in a control state, and the friction loss of the dynamometers 3a and 3b, l output characteristics,
Characteristics of control power supplies 7a and 7b, and torque control circuit 5a,
If there is a difference in the control characteristics of the dynamometers 3a, 5b,
This appeared as a speed difference of 3b, making it extremely difficult to maintain balance.

Therefore, the present invention has been made in order to eliminate the drawbacks of the conventional ones as described above.One dynamometer of the pair is torque controlled, and the other dynamometer is controlled to control the speed of the dynamometer that is torque controlled. By controlling the speed according to
The present invention provides a control device that can balance both dynamometers regardless of their friction loss, output characteristics, etc.

Hereinafter, one embodiment of the present invention will be explained based on the drawings.
In Fig. 2, parts that are the same as those in the figure are designated by the same reference numerals.
The dynamometers 3a and 3b are provided with speed detectors 8a and 8b, respectively, and the detected speed signals are input to the speed control circuit 9 of the dynamometer 3b, respectively. Said speed control circuit 9
operates the control power supply 7b based on the detection signals of both speed detectors 8a and 8b, and controls the speed of the dynamometer 3b to be constant so that it becomes the same as the speed of the dynamometer 3a. In this case, the control of the dynamometer 3a is the same as the conventional one, and includes a torque detector 4a, a torque control circuit 5a1, and a control power source 7a. In response to the detection signal, the dynamometer 3a is controlled so as to obtain a desired torque value. Therefore, the dynamometers 3a and 3b are placed in a stable control state, and can always be operated at the same speed and in a well-balanced manner, regardless of friction loss, output characteristics, etc.

Furthermore, FIG. 3 shows another embodiment of the present invention, in which speed detectors 8a and 8 are used to detect the speeds of dynamometers 3a and 3b.
Speed coefficient units 10a and 10b are respectively provided between the speed control circuit 9 of the dynamometer 3b and the speed control circuit 9 of the dynamometer 3b into which these detection signals are input, so that their speed setting coefficients can be arbitrarily determined.

Therefore, according to this embodiment, the ratio and difference between the rotational speeds of the dynamometers 3a and 3b can be arbitrarily determined by the set value of the speed setting coefficient, and the speed balance can always be maintained. Differential speed control can be performed at a constant rate for the controlled dynamometer 3a. Although the above embodiment describes a dynamometer system having a pair of output shafts, the present invention is not limited thereto and can be applied to a system having two or more pairs. As described above, according to the present invention, since the speed of one of the dynamometers of the pair is controlled by the speed of the other dynamometer, the speed balance of both dynamometers can always be maintained. Can be done.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional control device for a dynamometer system, and FIGS. 2 and 3 are block diagrams each showing an embodiment of the present invention. 1... Test object (engine), 2a, 2b...
Output shaft, 3a, 3b...Dynamometer, 5a...
...Torque control circuit, 8a, 8b... Speed detector, 9... Speed control circuit, 10a, 10b...
...Speed coefficient unit. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. In a control device for a dynamometer system that controls dynamometers connected to each of a pair of output shafts connected to each other via a differential device of a test object, A torque control circuit for torque control is provided, a speed detector is provided for each dynamometer, and the speed of the other dynamometer is controlled based on the detected speed with respect to the speed of the dynamometer to be torque controlled. A control device for a dynamometer system, characterized by being provided with a speed control circuit. 2. The control device for a dynamometer system according to claim 1, wherein the speed control circuit controls the other dynamometer at a constant speed according to the speed of the torque-controlled dynamometer. 3 A speed coefficient device is provided between the speed control circuit and each speed detector, and the speed of the other dynamometer is adjusted relative to the torque-controlled dynamometer according to the setting values of the speed factor devices. A control device for a dynamometer system according to claim 1, wherein the speed is controlled by the dynamometer system.